IS 5517:1993 30C8 Steel: Specifications & Listings
IS 5517:1993 30C8: 30C8 is a steel in IS 5517:1993 (Steels for Hardening and Tempering), intended in general for forgings and machined parts for engineering or automobile purposes.
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Chemical Composition (%)
C
Si
Mn
S
P
0.25-0.35
0.10-0.35
0.60-0.90
<=0.035
<=0.035
Mechanical Properties
Tensile Strength
600-750 MPa
Yield Strength (0.2% proof)
400 MPa min
Elongation
>=18%
Izod Impact
55 J min
Hardness (annealed)
<=187 HB
Condition
Hardened and tempered, ruling section up to 30 mm
More data from IS 5517:1993
From the standard
Heat treatment temperatures5 values
Hot working temperature
1200 to 850 °C
Normalising temperature
860 to 890 °C
Hardening temperature
860 to 890 °C
Quenching medium
Water or Oil
Tempering temperature
550 to 660 °C
Source: IS 5517:1993 with Amendments 1 to 3, Table 4
Properties after hardening and tempering, by ruling section1 section
Tensile strength (MPa)
0.2% proof stress, min (MPa)
Elongation, min (%)
Izod impact, min (J)
Limiting ruling section (mm)
600 to 750
400
18
55
30
Values apply to test bars taken from rounds along the direction of rolling. Izod impact values are for fine grained steels.
Source: IS 5517:1993 with Amendments 1 to 3, Table 5
Hardness by delivery condition3 conditions
As annealed (A), maximum
187 HB
As rolled (R), maximum
240 HB
Treated for improved machinability (M), maximum
170 HB
For improved machinability the microstructure of the steel may be mutually agreed between the manufacturer and the purchaser.
Source: IS 5517:1993 with Amendments 1 to 3, Table 6
Active IS 5517:1993 30C8 Listings on M-EX (For Sale)